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Previously, we looked at how McDonnell lost a significant contract with the US Navy after their upgraded F3H Demon failed a fly off competition against their competitor, Chance-Vought’s entry which became the F-8U Crusader.

An early mockup of a modified F3H which is beginning to show some familiar visual characteristics of the F-4. (Source: US Navy National Museum of Naval Aviation)

McDonnell engineer Herman Barkley took the Demon’s rejection as a personal challenge and immediately began designing an unsolicited new aircraft initially without military funding.[1] Original sketches for the new craft consisted of yet another version of the Demon, similar to the design that had already failed against Vought’s F-8U. The US Navy had a vested interest in allowing McDonnell to experiment with the design. It could keep McDonnell afloat, enabling it to remain a valuable supplier, and perhaps reap some return on the initial investment they had both placed in the failed F3H. Upon review of these sketches, The US Navy did support the project, but gave no stated mission requirements for the plane, encouraging McDonnell to experiment on the drawing board. According to J. S. McDonnell himself:

All we had to work with in the beginning [of F-4 Phantom II Development] was a gleam in the customer’s eye […] What followed was two years […] of orchestrated confusion.

The US Navy, because of their doctrinal assumptions, wanted to focus on high-speed interceptors but was purposefully vague about communicating this, hoping McDonnell would reach in new and unexpected directions. This lack of specificity and a desire to maximise profits by designing a versatile plane that functioned in many contexts led McDonnell to develop a multi-role aircraft not optimised for the air-to-air mission.[2]

The confusion continued until Spring of 1955 when Commander Francis X. Timmes (newly in charge of the project) emphasised the high-speed interceptor role and stressed adaptability. Those concepts required that the plane to have two seats, two engines, and an armament of only missiles. The plane thus featured eleven hardpoints for carrying bombs or missiles, the most ever designed on an airframe at that time. The homogenous armament and dual-pilot setup both theoretically enhanced adaptability, since dogfighting was (allegedly) unnecessary, the lack of guns made the plane lighter (thus faster), and pilot duties could be split between two people. In July 1955, the US Navy rewarded McDonnell’s efforts with a contract for the production of seven prototypes.

The Phantom’s unique look was the result of over 5,300 hours of wind tunnel tests, which revealed a significant problem in supersonic flight. The plane was susceptible to ‘roll coupling,’ which is a technical way of saying the plane became uncontrollable – a condition from which pilots were trained to eject immediately. The angled wingtips and tail decreased the chances of this occurring. To add to stability concerns without sacrificing speed, the Phantom was given the ‘Stab Aug’ system that could sense unstable flight paths and automatically correct for them quicker than a pilot could manually. Computer controlled intake ramps to control air flow into the engines also increased the plane’s top speed. Another computerised system, ‘Boundary Layer Control,’ sent excess air from the engines over the wings to generate more lift and increase speed and acceleration. [3]

Herman Barkley (left) with test pilot Robert Little(center) and fellow engineer David Lewis (right) in front of a prototype of the F-4. (Source: Wikimedia)

Though the bond between the US Navy and its developers was strong, the military was loathed to place all its eggs in one basket. Timmes solicited other designs to fit the same roles as the Phantom in August 1955. The company that stepped up to the plate was none other than McDonnell’s old nemesis: Chance-Vought. Vought had developed an upgraded version of their successful F-8U Crusader, the very plane that had beaten McDonnell’s F3H Demon. Both new designs were set to compete in an unofficial fly off beginning on 15 September 1958. The tests emphasised the assumptions of the time, focusing on maximum speed and climbing rates. The assessments did not include manoeuvrability, gunnery, or other metrics pertinent to air-to-air combat.

In every tested category, the F8U-3 Crusader proved superior. It even had better fuel mileage. Its only drawbacks were a lower payload and time-consuming maintenance requirements. Despite this, George Spandenberg, then the director of Bureau of Aeronautics’ Evaluation Division, thought that single-seat, single-engine planes were inherently unreliable and argued that a two-seat plane would boost morale. Thus he boldly asserted, ‘The single-seat fighter era is dead.’ Advocates of the F-4 often claim the Phantom ‘won’ the contest (since it did win the US Navy contract after all), although a close look at the fly off reveals the upgraded Crusader had clear performance advantages in every category.[4]

Despite the Phantom’s lacklustre performance at the fly off, it was still an impressive aircraft in many respects. Between December 1959 and April 1962, the F-4 set over a dozen world records, the most coveted (and revealing of the plane’s doctrinal design focus) of which was that of absolute top speed: 1,606.3 miles per hour.[5] The F-4 also possessed many problems that came back to haunt the military over the jungles of Vietnam, and that appear almost negligent in retrospect. Aside from the stability issue (which caused ‘departure’ or ‘the adverse yaw effect,’ terms for when the plane loses control during maneuvers), the almost non-existent rear-visibility was a problem, as were the giant plumes of black smoke produced by the engines that gave away the location and heading of every Phantom. The plane was also quite vulnerable to ground fire because its hydraulic lines were delicate and devoid of redundancy. Indeed, ground fire downed more F-4s in Vietnam than any other single threat. Across US Air Force (USAF), the US Navy and the US Marine Corps combined, from January 1962 to January 1973, 930 planes were lost to small arms ground fire, or, 45% of losses by known causes. AAA claimed 632; SAMs shot down 191; MiGs destroyed 79, and friendly fire claimed 25.

The USAF observed these record-setting demonstrations and grew interested in the plane’s usefulness as a strategic bomber and interceptor.[6] After a series of tests, USAF eventually ordered more than triple the number of Phantoms as the Navy. McDonnell finally created four new models of the Phantom to USAF specifications, the first and most significant of which was the F-4C.[7]

A flight of US Air Force McDonnell F-4C Phantom II fighters refuel from a Boeing KC-135A Stratotanker aircraft before making a strike against targets in North Vietnam. The Phantoms are loaded with six 750 pound general purpose bombs, four AIM-7 Sparrow air to air missles, and 370 gallon external fuel tanks on the outboard pylons. (Source: Wikimedia)

Although the Phantom would undoubtedly have performed extremely well in its designed role of intercepting enemy bombers, it ironically never had to. Instead of saving the world from nuclear Armageddon in the hypothetical World War III, the F-4 instead flew in a limited war over the jungles of a tiny third world country that many Americans had trouble locating on a map. The enemies it faced were not large lumbering bombers threatening nuclear annihilation, but missiles, ground fire, and manoeuvrable MiG fighters much more adept at air combat. Statistically, the deadliest enemy for the Phantom, one of the most powerful and expensive planes in US history to that point, was an individual on the ground with a machine gun. Similar to the doctrine that spawned it, the F-4 was the right plane for the wrong war.

The F-4 Phantom II was a fighter plane possessing few characteristics of traditional fighters. It was large, cumbersome, and built around the concept of long range attacks, sacrificing the agility and armament necessary of true air superiority craft. Originally conceived as an interceptor and soon burdened by ‘mission creep’ that insisted it handle multiple roles, the plane was the poster child for pre-Vietnam USAF doctrine, namely, the quasi-religious devotion to strategic bombing that minimised all other roles of air power.

Mike Hankins is a doctoral candidate at Kansas State University, where he teaches World History, the History of Airpower, and the History of Comic Books, and he is currently working on his dissertation, ‘Sources of Innovation: The Cultural and Technological Origins of Fourth Generation Fighter Aircraft, 1964-1991.’ He completed his master’s thesis at the University of North Texas in 2013, titled ‘The Phantom Menace: The F-4 in Air-to-Air Combat in the Vietnam War. He has a web page and can be found on Twitter at @hankinstien.